Unless I am planning a big campaign, my armies tend to be ad-hoc compositions of whatever units are available. I frequently use stacks that are rather heavy on mercenaries or local levies, i.e. soldiers that have only a loose attachment to my empire. However, these armies are always built around a core of professional, or at least citizen militia, units.
So, not quite historical, but not unrealistic either.
When I do plan a campaign, I prefer unit types that can be expected to stay loyal: my faction's core units plus quality mercenaries. However, I am quite willing to vary proportions (i.e. more emphasis on cavalry than infantry or visa versa) if that makes the army more effective.
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